Remove Milestone token wildcard values

Remove wildcard values for milestone token as
GraphQL query doesn't support it yet.

Changelog: fixed
EE: true

ee/app/assets/javascripts/roadmap/mixins/filtered_search_mixin.js

@@ -9,8 +9,6 @@ import {
   OPERATOR_IS_NOT,
   OPERATOR_IS,
   OPERATOR_IS_AND_IS_NOT,
-  DEFAULT_MILESTONE_UPCOMING,
-  DEFAULT_MILESTONE_STARTED,
 } from '~/vue_shared/components/filtered_search_bar/constants';
 import AuthorToken from '~/vue_shared/components/filtered_search_bar/tokens/author_token.vue';
 import EmojiToken from '~/vue_shared/components/filtered_search_bar/tokens/emoji_token.vue';
@@ -122,7 +120,7 @@ export default {
           symbol: '%',
           token: MilestoneToken,
           operators: OPERATOR_IS_ONLY,
-          defaultMilestones: [DEFAULT_MILESTONE_UPCOMING, DEFAULT_MILESTONE_STARTED],
+          defaultMilestones: [], // TODO: Add support for wildcards once https://gitlab.com/gitlab-org/gitlab/-/issues/356756 is resolved
           fetchMilestones: (search = '') => {
             return axios.get(this.groupMilestonesPath).then(({ data }) => {
               // TODO: Remove below condition check once either of the following is supported.

ee/spec/frontend/roadmap/mock_data.js

@@ -827,7 +827,7 @@ export const mockMilestoneTokenConfig = {
   token: MilestoneToken,
   operators: OPERATOR_IS_ONLY,
   fetchMilestones: expect.any(Function),
-  defaultMilestones: expect.any(Array),
+  defaultMilestones: [],
 };
 
 export const mockConfidentialTokenConfig = {